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A baroclinic coastal trapped wave event in the Gulf of Naples (Tyrrhenian Sea)

机译：那不勒斯湾（第勒尼安海）的一次斜压沿海困波事件

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In this study, a baroclinic coastal trapped wave, with period similar to 4.5days and cross-shore scale similar to 3km, is identified in the outputs of a very-high-resolution ocean circulation model of the Campania coastal system (central Tyrrhenian Sea; including the Gulfs of Salerno, Naples, and Gaeta). The outputs are from a simulation spanning June 2003, a month in which the surface winds were always weak, except for a strong northeasterly wind event that lasted 1 day (20 June). This event is found to generate a strong upwelling along the Campania coasts, whose relaxation-virtually free, because of the weakness of the winds-produces coastal current fluctuations that propagate to the north, spanning the three gulfs. The dynamics (analyzed with a focus on the Gulf of Naples) is found to share important features with baroclinic Kelvin waves in a two-layer model, such as the sharp cross-shore decrease of the perturbation amplitude and the vertical reversal of the long-shore current velocities. The simulated phase speed, cross-shore extension, and wavelength of the perturbation are also close to those obtained using a two-layer approximation of the dynamics. Moreover, the propagation described by the models is shown to be compatible with current measurements that were made in June 2003 at the southern entrance of the Gulf of Naples. Experimental implications related to the specific oceanographic problem are finally discussed, and an experimental strategy-inspired by our modeling approach-aimed at identifying the phenomenon is proposed.
机译：在这项研究中，在坎帕尼亚沿海系统（第勒尼安海中部；第勒尼安海中部）的超高分辨率海洋环流模型的输出中，发现了一个斜斜的沿海滞波，其周期近似为4.5天，跨岸规模近似于3km。包括萨勒诺湾，那不勒斯和加埃塔湾）。输出结果来自2003年6月的模拟，该月的地面风一直很弱，除了持续1天（6月20日）的强烈东北风事件。发现该事件沿坎帕尼亚海岸产生了强烈的上升流，由于风的弱势，坎帕尼亚沿岸的松弛几乎没有释放，从而产生了向北传播的跨越三个海湾的沿海水流波动。发现动力学（以那不勒斯海湾为中心进行分析）在两层模型中与斜斜开尔文波具有重要的特征，例如扰动幅度的跨岸急剧下降和长波峰的垂直反转。岸上流速。模拟的相速度，跨岸延伸和扰动波长也接近于使用动力学的两层近似得到的那些。此外，模型所描述的传播被证明与2003年6月在那不勒斯海湾的南入口进行的当前测量兼容。最后讨论了与特定海洋学问题有关的实验意义，并提出了一种以我们的建模方法为灵感的旨在识别现象的实验策略。

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